From da8c245516590ebb30d710158843c1b5d1e6832a Mon Sep 17 00:00:00 2001
From: Igor Emets <i.yemets@p1k.co.uk>
Date: Wed, 8 May 2019 14:38:27 +0300
Subject: [PATCH] Fixing #2668, add null-checks in on_outro callback for
 IfBlock

---
 src/compile/render-dom/wrappers/IfBlock.ts | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/src/compile/render-dom/wrappers/IfBlock.ts b/src/compile/render-dom/wrappers/IfBlock.ts
index f3b5c7f2b2..7b0d655a00 100644
--- a/src/compile/render-dom/wrappers/IfBlock.ts
+++ b/src/compile/render-dom/wrappers/IfBlock.ts
@@ -319,6 +319,9 @@ export default class IfBlockWrapper extends Wrapper {
 		const destroy_old_block = deindent`
 			@group_outros();
 			@on_outro(() => {
+				if (${if_blocks}[${previous_block_index}] === null) {
+					return;
+				}
 				${if_blocks}[${previous_block_index}].d(1);
 				${if_blocks}[${previous_block_index}] = null;
 			});
@@ -430,6 +433,9 @@ export default class IfBlockWrapper extends Wrapper {
 			? deindent`
 				@group_outros();
 				@on_outro(() => {
+					if (${name} === null) {
+						return;
+					}
 					${name}.d(1);
 					${name} = null;
 				});